Speckled Sussex or Brown Leghorn, or both. The one on the right seems a bit more Sussex to me--they tend to be redder. They also have Spangled Old English which would look the same. The thing to watch for is if the legs end up pink/white (Sussex) or Yellow (Leghorn).
In the other images, that weren't covered yet (I agree with the others' responses)--Black or Blue Cochin, Columbian Wyandotte or Rock, (or White Giant, but legs look too yellow) Generic Red Bird (Rhode Island Red, New Hampshire, Production Red...). The yellow feather shanked bird could be a Faverolle (5 toes) as mentioned, or Wheaten Marans (4 toes). Other yellow chicks--white birds--White Leghorn, Delaware, Austra White--depends on shank color and if there any black spots.
Thx!!! Lots of info!